Remember how GA said to LE something along the lines of, "I'm telling you guys, I don't like the smell in the car", and then they went on to talk about how and why GA recognized that smell as a dead body (this was in one of the video'd interviews). If I'm not mistaken, he also told them at the house that he didn't like the smell in the car.
OK, so we know GA is on record on more than one occasion as saying he didn't like the smell. We are assuming that each and every time he talks about the smell to LE he is referring to when he picked up the car at the tow yard. How do we know that he has not (on at least one of the occasions) been referring to the smell on the day of the gas cans incident?